發(fā)布時(shí)間：2018-01-08 09:41

  本文關(guān)鍵詞：紫外光通信系統(tǒng)傳輸模型研究　出處：《北京郵電大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 紫外光通信 非視距 大氣湍流 空間分集

【摘要】：曰盲紫外光通信是近年來(lái)興起的一種無(wú)線光通信技術(shù),具有非視距、鏈路穩(wěn)定可靠、抗干擾能力強(qiáng)、安全隱蔽、可全天候工作等一系列獨(dú)特的潛在優(yōu)勢(shì)。大氣粒子的散射作用與光湍流效應(yīng)使得紫外光通信信道具有隨機(jī)性,給信號(hào)傳輸帶來(lái)不確定因素。因此,研究紫外光通信的大氣信道特性有著重要意義。 本論文圍繞大氣散射信道這一關(guān)鍵問題展開創(chuàng)新性理論研究,深入探討了非視距紫外光通信的大氣信道特性,主要成果如下： 1.采用微元光束法,首次建立了任意收發(fā)機(jī)指向幾何條件下的單散射傳輸模型,可準(zhǔn)確計(jì)算接收能量值。對(duì)從發(fā)射機(jī)立體角內(nèi)以任意角度發(fā)射出的光束與接收機(jī)視場(chǎng)體的相交情況進(jìn)行了詳細(xì)分析,消除了以往單散射模型中發(fā)射機(jī)光束體與接收機(jī)視場(chǎng)體的軸線必須共面的限制。 2.建立了非共面條件下的單散射簡(jiǎn)化模型,仿真結(jié)果顯示：在發(fā)射光束或接收視場(chǎng)較窄的前提下,可對(duì)任意收發(fā)機(jī)指向的紫外光通信鏈路性能進(jìn)行快速的近似估計(jì),與以往的簡(jiǎn)化模型相比具有更高的準(zhǔn)確性,適用范圍也更廣,特別適用于紫外Ad Hoc網(wǎng)絡(luò)等需要快速計(jì)算散射功率的場(chǎng)景。 3.基于已建立的微元光束單散射模型,推導(dǎo)了非視距紫外光通信的時(shí)延擴(kuò)展與脈沖響應(yīng)函數(shù),并進(jìn)行了蒙特卡羅仿真驗(yàn)證。建立了收發(fā)機(jī)非共面條件下的蒙特卡羅多散射模型,首次仿真分析了在任意收發(fā)機(jī)幾何參數(shù)及不同通信距離的條件下,單散射與多散射對(duì)應(yīng)的接收能量和脈沖展寬之間的誤差大小,給出了非視距紫外光通信中滿足單散射近似的收發(fā)機(jī)幾何條件。 4.考慮大氣湍流導(dǎo)致閃爍衰減的情況下,推導(dǎo)了隨機(jī)混濁介質(zhì)中的非視距紫外光通信湍流模型。利用湍流渦旋的散射效應(yīng)首次建立了隨機(jī)湍流介質(zhì)中的紫外光通信單散射功率模型,分析了適用于紫外光通信的能量譜密度,以及單散射輻照度與湍流特征參數(shù)、光波波長(zhǎng)、收發(fā)機(jī)距離等的關(guān)系,探討了該介質(zhì)中的散射作用與瑞利散射、米散射之間的關(guān)聯(lián)性。 5.推導(dǎo)了空間相關(guān)湍流衰落中的多接收機(jī)的非視距聯(lián)合空間分布,分析了基于最大似然策略以及選擇合并、最大比合并、等增益合并等線性合并技術(shù)實(shí)現(xiàn)的紫外光通信空間分集接收系統(tǒng)的性能。仿真結(jié)果表明：當(dāng)大氣湍流較弱時(shí),最大似然策略得到的性能比最大比合并和等增益合并更好,但優(yōu)勢(shì)并不十分明顯；隨著湍流變得更強(qiáng),在高信噪比場(chǎng)景中,最大比合并和等增益合并方法要優(yōu)于最大似然分集接收。
[Abstract]:Blind UV communication is a kind of wireless optical communication technology which has emerged in recent years . It has a series of unique potential advantages such as non - apparent distance , reliable link stability , strong anti - jamming capability , safe concealment , all - weather work and so on . The scattering effect of atmospheric particles and the effect of light turbulence make the channel of ultraviolet light have randomness and cause uncertainty . Therefore , it is important to study the atmospheric channel characteristics of ultraviolet communication . In this paper , an innovative theoretical study is carried out about the key problem of atmospheric scattering channel , and the atmospheric channel characteristics of non - sight distance ultraviolet communication are discussed in detail . 1 . A single - scattering transmission model with arbitrary transceiver pointing to geometric conditions is established for the first time by adopting a micro - beam method , and the received energy value can be accurately calculated . The intersection between the light beam emitted from any angle in the solid angle of the transmitter and the field of view of the receiver is analyzed in detail , and the limitation that the axis of the transmitter beam body and the receiver field of view of the receiver must be coplanar is eliminated in the conventional single - scattering model . 2 . The simplified model of single scattering under non - coplanar condition is established , and the simulation results show that , under the premise of narrow transmitting beam or receiving field of view , the fast approximate estimation can be carried out on the performance of the UV communication link which can be directed by any transceiver , which has higher accuracy and wide application range compared with the previous simplified model , and is especially suitable for the scene with the need of fast calculation of scattered power in the ultraviolet Ad Hoc network and the like . 3 . Based on the established micro - beam single - scattering model , the delay spread and impulse response function of non - sight distance ultraviolet communication is deduced , and Monte Carlo simulation verification is carried out . A Monte Carlo multi - scattering model under non - coplanar condition of the transceiver is established . The error size between the received energy corresponding to the single scattering and the multi - scattering and the pulse broadening are analyzed for the first time , and the geometrical conditions of the transceiver that satisfy the single scattering approximation in the non - sight distance ultraviolet communication are given . 4 . In the light of the scintillation decay caused by atmospheric turbulence , the non - sight distance ultraviolet communication turbulence model in the random turbid medium is derived . The scattering effect of the turbulent vortex is used for the first time to establish the UV communication single scattering power model in the random turbulence medium . The relation between the energy spectral density suitable for the ultraviolet communication and the characteristic parameters of the turbulence , the wavelength of the light wave and the distance of the transceiver are analyzed . The correlation between the scattering effect and the Rayleigh scattering and the meter scattering in the medium is discussed . 5 . The spatial distribution of multi - receiver in spatial - dependent turbulent fading is derived . The performance of the spatial diversity receiving system based on the maximum likelihood strategy and the combination of choice of combining , maximum ratio combining , and so on is analyzed . The simulation results show that when the atmospheric turbulence is weak , the maximum likelihood strategy has better performance than the maximum ratio combining and the equal gain combining , but the advantage is not quite obvious . As the turbulence becomes stronger , the maximum ratio combining and the equal gain combining method is better than the maximum likelihood diversity reception in the high signal - to - noise ratio scene .

【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

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